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        <h2>
          <span class="refentrytitle">vbapmove</span>
        </h2>
        <p>vbapmove — 
      Distributes an audio signal among many channels with moving virtual sources.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp161090480"></a>
        <h2>Description</h2>
        <p>
      Distributes an audio signal among upto 64 channels with moving
      virtual sources.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp161091744"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">ar1[, ar2...] <span class="command"><strong>vbapmove</strong></span> asig, idur, ispread, ifldnum, ifld1 \
      [, ifld2] [...]</pre>
        <pre class="synopsis">aarray[] <span class="command"><strong>vbapmove</strong></span> asig, idur, ispread, ifldnum, ifld1 \
      [, ifld2] [...]</pre>
      </div>
      <div class="refsect1">
        <a id="idp161095376"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>idur</em></span> -- the duration over which the
    movement takes place.
    </p>
        <p>
      <span class="emphasis"><em>ispread</em></span> -- spreading of the virtual source
    (range 0 - 100).  If value is zero, conventional amplitude panning
    is used. When <span class="emphasis"><em>ispread</em></span> is increased, the
    number of loudspeakers used in panning increases. If value is 100,
    the sound is applied to all loudspeakers. 
    </p>
        <p>
      <span class="emphasis"><em>ifldnum</em></span> -- number of fields (absolute value must be 2 or larger). If <span class="emphasis"><em>ifldnum</em></span> is positive, the virtual source movement is a polyline specified by given directions. Each transition is performed in an equal time interval. If <span class="emphasis"><em>ifldnum</em></span> is negative, specified angular velocities are applied to the virtual source during specified relative time intervals (see below).
    </p>
        <p>
      <span class="emphasis"><em>ifld1, ifld2, ...</em></span> -- azimuth angles or angular velocities, and relative durations of movement phases (see below).
    </p>
      </div>
      <div class="refsect1">
        <a id="idp161101504"></a>
        <h2>Performance</h2>
        <p>
      <span class="emphasis"><em>asig</em></span> -- audio signal to be panned
    </p>
        <p>
      <span class="emphasis"><em>vbapmove</em></span> allows the use of moving virtual sources. If <span class="emphasis"><em>ifldnum</em></span> is positive, the fields represent directions of virtual sources and equal times, <span class="emphasis"><em>iazi1</em></span>, [<span class="emphasis"><em>iele1</em></span>,] <span class="emphasis"><em>iazi2</em></span>, [<span class="emphasis"><em>iele2</em></span>,], etc.  The position of the virtual source is interpolated between directions starting from the first direction and ending at the last. Each interval is interpolated in time that is fraction total_time / number_of_intervals of the duration of the sound event.
    </p>
        <p>
      If <span class="emphasis"><em>ifldnum</em></span> is negative, the fields represent angular velocities and equal times. The first field is, however, the starting direction, <span class="emphasis"><em>iazi1</em></span>, [<span class="emphasis"><em>iele1</em></span>,] <span class="emphasis"><em>iazi_vel1</em></span>, [<span class="emphasis"><em>iele_vel1</em></span>,] <span class="emphasis"><em>iazi_vel2</em></span>, [<span class="emphasis"><em>iele_vel2</em></span>,] .... Each velocity is applied to the note that is fraction total_time / number_of_velocities of the duration of the sound event.  If the elevation of the virtual source becomes greater than 90 degrees or less than 0 degrees, the polarity of angular velocity is changed. Thus the elevational angular velocity produces a virtual source that moves up and down between 0 and 90 degrees.
    </p>
        <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
          <table border="0" summary="Warning">
            <tr>
              <td rowspan="2" align="center" valign="top" width="25">
                <img alt="[Warning]" src="images/warning.png" />
              </td>
              <th align="left">Warning</th>
            </tr>
            <tr>
              <td align="left" valign="top">
                <p>Please note that all <span class="emphasis"><em>vbap</em></span> panning opcodes require the <span class="emphasis"><em>vbap</em></span> system to be initialized using <a class="link" href="vbaplsinit.html" title="vbaplsinit"><em class="citetitle">vbaplsinit</em></a>.</p>
              </td>
            </tr>
          </table>
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      </div>
      <div class="refsect1">
        <a id="idp161113104"></a>
        <h2>Examples</h2>
        <p>
      See the entry for <a class="link" href="vbap8move.html" title="vbap8move"><em class="citetitle">vbap8move</em></a> for an example of usage of the <span class="emphasis"><em>vbapXmove</em></span> opcodes.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp161115760"></a>
        <h2>Reference</h2>
        <p>
      Ville Pulkki: <span class="quote">“<span class="quote">Virtual Sound Source Positioning Using Vector Base Amplitude Panning</span>”</span> <span class="emphasis"><em>Journal of the Audio Engineering Society</em></span>, 1997 June, Vol. 45/6, p. 456.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp161117936"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the vbapmove opcode. It uses the file <a class="ulink" href="examples/vbapmove.csd" target="_top"><em class="citetitle">vbapmove.csd</em></a>.
      </p>
        <div class="example">
          <a id="idp161119792"></a>
          <p class="title">
            <strong>Example 970. Example of the vbapmove opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac  <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o vbapmove.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 4	<span class="comment">;quad</span>
<span class="ohdr">0dbfs</span>  <span class="op">=</span> 1

<span class="opc">vbaplsinit</span> 2, 4, 0, 90, 180, 270

<span class="oblock">instr</span> 1

asig <span class="opc">diskin2</span> "beats.wav", 1, 0, 1		<span class="comment">;loop beats.wav</span>
a1,a2,a3,a4 <span class="opc">vbapmove</span>  asig, p3, 1, 2, 310, 180	<span class="comment">;change movement of soundsource in</span>
     <span class="opc">outq</span> a1,a2,a3,a4				<span class="comment">;the rear speakers</span>

<span class="oblock">endin</span> 
<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>

<span class="stamnt">i</span> 1 0 5

<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
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        <p><br class="example-break" />
    </p>
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      <div class="refsect1">
        <a id="idp161124080"></a>
        <h2>See Also</h2>
        <p>
     <a class="link" href="vbap.html" title="vbap"><em class="citetitle">vbap</em></a>,
      <a class="link" href="vbap16.html" title="vbap16"><em class="citetitle">vbap16</em></a>,
      <a class="link" href="vbap16move.html" title="vbap16move"><em class="citetitle">vbap16move</em></a>,
      <a class="link" href="vbap4.html" title="vbap4"><em class="citetitle">vbap4</em></a>,
      <a class="link" href="vbap4move.html" title="vbap4move"><em class="citetitle">vbap4move</em></a>,
      <a class="link" href="vbap8.html" title="vbap8"><em class="citetitle">vbap8</em></a>,
      <a class="link" href="vbap8move.html" title="vbap8move"><em class="citetitle">vbap8move</em></a>,
      <a class="link" href="vbaplsinit.html" title="vbaplsinit"><em class="citetitle">vbaplsinit</em></a>,
      <a class="link" href="vbapz.html" title="vbapz"><em class="citetitle">vbapz</em></a>,
      <a class="link" href="vbapzmove.html" title="vbapzmove"><em class="citetitle">vbapzmove</em></a>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp161134768"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Ville Pulkki</td>
          </tr>
          <tr>
            <td>Sibelius Academy Computer Music Studio</td>
          </tr>
          <tr>
            <td>Laboratory of Acoustics and Audio Signal Processing</td>
          </tr>
          <tr>
            <td>Helsinki University of Technology</td>
          </tr>
          <tr>
            <td>Helsinki, Finland</td>
          </tr>
          <tr>
            <td>May 2000</td>
          </tr>
          <tr>
            <td>Author: John ffitch</td>
          </tr>
          <tr>
            <td>July 2012, Sept 2013</td>
          </tr>
        </table>
        <p>
    </p>
        <p>New in Csound Version 5.17.13</p>
        <p>Array outputs new in Csound Version 6.01</p>
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